dev/em: Link is not up until 2 seconds after "ifconfig up"

[Craig Boston]

On Sunday 07 December 2003 07:39 pm, Jun Kuriyama wrote:
> At Sun, 7 Dec 2003 15:04:51 +0600 (NOVT),
>
> Hmm, no luck.  I've fixed the speed and mediaopt both of em(4) and
> switch, but it shows autoselect state and no carrier...

Hmm, just kind of a 'me too', but I've noticed some unusual behaviour with the 
link state of em as well.

It seems that if the interface is in the "down" state, it always shows as "no 
carrier" even if something is plugged in.  It isn't until something tries to 
configure it or I manually issue an ifconfig up that it actually 
autonegotiates the link speed, etc.

Most (all that support link state?) other network drivers in FreeBSD seem to 
report the link state even if the interface is down.  I know for sure that 
fxp and xl do.  IMHO this is a useful feature because it allows sufficiently 
smart scripts to change their behavior -- i.e. only run dhclient on 
interfaces that actually have something plugged in.

Craig